Source file src/pkg/vendor/golang.org/x/crypto/internal/chacha20/chacha_s390x.go

     1	// Copyright 2018 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build s390x,!gccgo,!appengine
     6	
     7	package chacha20
     8	
     9	import (
    10		"golang.org/x/sys/cpu"
    11	)
    12	
    13	var haveAsm = cpu.S390X.HasVX
    14	
    15	const bufSize = 256
    16	
    17	// xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
    18	// be called when the vector facility is available.
    19	// Implementation in asm_s390x.s.
    20	//go:noescape
    21	func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32, buf *[256]byte, len *int)
    22	
    23	func (c *Cipher) xorKeyStreamAsm(dst, src []byte) {
    24		xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter, &c.buf, &c.len)
    25	}
    26	
    27	// EXRL targets, DO NOT CALL!
    28	func mvcSrcToBuf()
    29	func mvcBufToDst()
    30	

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